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Related Experiment Videos

Posterior-stabilized and cruciate-retaining total knee replacement: a randomized study.

C R Clark1, C H Rorabeck, S MacDonald

  • 1Department of Orthopaedic Surgery, University of Iowa Hospitals and Clinics, Iowa City 52242, USA.

Clinical Orthopaedics and Related Research
|November 22, 2001
PubMed
Summary

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This study found no significant clinical differences between posterior-stabilized and cruciate-retaining total knee implants at 2 and 3 years. Both implant types demonstrated comparable outcomes for osteoarthritis patients undergoing primary total knee replacement.

Area of Science:

  • Orthopedic surgery
  • Biomedical engineering
  • Clinical research

Background:

  • Total knee replacement is a common procedure for osteoarthritis.
  • Implant design, specifically posterior-stabilized versus cruciate-retaining, may influence outcomes.
  • Patient selection criteria are crucial for comparable study groups.

Purpose of the Study:

  • To compare clinical, radiographic, and quality of life outcomes between posterior-stabilized and cruciate-retaining primary total knee implants.
  • To evaluate the efficacy of different total knee arthroplasty designs in patients with osteoarthritis and an intact posterior cruciate ligament.

Main Methods:

  • A randomized controlled study enrolled 143 patients (57-89 years) with osteoarthritis.
  • Patients were randomized to posterior-stabilized (n=76) or cruciate-retaining (n=67) AMK total knee implants.

Related Experiment Videos

  • Follow-up included 2-year (n=108) and 3-year (n=73) assessments of clinical outcomes using the Knee Society score and range of motion.

    • Main Results:

    • At 2 years, the Knee Society clinical rating scores were similar: 157.1 (posterior-stabilized) vs. 156.5 (cruciate-retaining).
    • At 3 years, scores were 156.8 (posterior-stabilized) vs. 163.5 (cruciate-retaining).
    • Range of motion at 2 years was 113.6° (posterior-stabilized) vs. 108.5° (cruciate-retaining); at 3 years, 108.5° vs. 108.3°, respectively. No notable differences were observed between implant types at either time point.

    Conclusions:

    • No significant differences in clinical outcomes were found between posterior-stabilized and cruciate-retaining total knee implants at 2-year follow-up.
    • This trend of comparable outcomes persisted at the 3-year follow-up.
    • Both implant designs appear to offer similar efficacy for primary total knee replacement in carefully selected osteoarthritis patients.